Synthesis and characterization of novel magnesium carboxylate frameworks

INOR 359

Zeric Hulvey, zhulvey@chem.ucsb.edu, Materials Research Laboratory, University of California, Santa Barbara, Santa Barbara, CA 93106-5121 and Anthony K. Cheetham, cheetham@mrl.ucsb.edu, Materials Research Laboratory, University of California, Santa Barbara, CA 93106.
Four new three-dimensional magnesium containing metal-organic hybrid compounds have been synthesized in an effort to prepare low density materials for hydrogen storage. The compounds were prepared hydrothermally and characterized using both powder and single crystal X-ray diffraction. Three of these compounds are analogs of known transition metal structures with squarate (I, Pn-3n, a = 16.276(5) Å), diglycolate (II, P212121, a = 6.860(1) Å, b = 9.993(1) Å, c = 10.884(1) Å), and glutarate (III, R-3, a = 10.744(2) Å, c = 28.677(5) Å) ligands; the fourth is a novel structure using cyclobutanetetracarboxylate (IV, Pccn, a = 9.382(1) Å, b = 14.410(2) Å, c = 8.725(1) Å) which contains potassium as well as magnesium cations.